I borrowed a Singer model 2638 but no manual. How do I thread both the top and the bobbin correctly. If diretion could have pictures or diagrams that would be more helpful than just word directions. Thanks very much.
Lorr

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Not sure what you mean but assume the top and bobbin threads are not interlocking to form a stitch. Possibly, the needle is installed facing the incorrect direction. Also, could be threaded incorrectly. Review the manual and make sure the thread path is correct for the top thread (ALWAYS RAISE the presser foot when threading the top!). Also check that the bobbin is turning the correct direction in the bobbin case and that the bobbin case is threaded completely and correctly.

Lower the presser foot. Then hold the top thread tail in your left hand and manually turn the handwheel one revolution toward you. If everything is okay, the top thread will pull up a loop from the bobbin thread. Raise the presser foot and you can sweep a pencil, stiletto, or something similar under the presser foot to pull the rest of the bobbin thread up to the top.

try changing the needle--flat side goes to the back of machinerethread the machine top & bobbin--make sure to use every thread guidemake sure bobbin is wound correctly & inserted correctly in the bobbin caseclean under the needle plate & in the bobbin area for lint or loose threadsif you don't have a manual try singerGo to the singer website
Click on customer support--there will be a drop down menu
Choose instruction manual
In the box type the model number(example 758)
Click search

Go to the singer website
Go to the home page
Go to customer service--click on it--it will show a small menu--click on instruction manual
In the box put the model number (example 5528) & click searchand it will bring up the manuals that are available

try checking the bobbin case for burrs & make sure the the small bar on the bobbin case is not bentmake sure the bobbin case is in correctly

Which Singer machine do you have? I know how to wind and insert a full bobbin for some models.

Some wind the bobbin with it in the case. This is the case with my Touch & Sew. Inserting a full bobbin is simple. Open the slide plate and drop in the bobbin with the rings up. Make sure that to hold the bobbin thread so that it comes off at the left. Then close the slide plate and make sure that the end of the bobbin thread is coming through the notch. Hold onto the threads and turn the handwheel until the top and bottom thread come back up with a twist. To wind a bobbin for this machine, open the slide plate (some models have a little mark to line up the slide plate). Put in the empty bobbin and thread the top normally. Set the machine to straight stitch and push the bobbin wind button in. (This has a bulls-eye symbol on it.) Wrap the end of the top thread around the presser foot screw several times and hold onto the end. Step on the foot control to start winding. Keep winding until the bobbin is full. The thread wound onto the screw should break. Pull some extra thread and cut it to separate the top and bottom threads. Close the slide plate and set your desired stitch.

Other models are wound at the top of the machine. For some of with a drop-in bobbin, you need to bring the thread down to a catch and then off to the left to another catch. Some have a vertical bobbin. I don't remember if they all have a removable case. Those that do need the thread to come through a notch on the case that pulls the thread under a spring that keeps the bobbin tension. However you should check your manual. If you do not have a manual, check if one is available online. (http://www.singerco.com/accessories/instruction-manuals has many of the Singer manuals for sale or download.)

If you post a comment with the model of your machine, I'll give you a description of threading the bobbin or winding one.

Hi! Your machine uses Class15J bobbins (http://www.singerco.com/accessories/notions.html)
No, bobbins aren't really interchangeable, even if they fit. For example, I have a Kenmore 385 Elite and a Brother SX-8060. One (the Kenmore) uses bobbins with a curved top and bottom. The Brother uses bobbins that are flat on top and bottom. Either bobbin fits in either machine. But if I use a curved top and bottom in the Brother, it clicks and clacks and has a greater tendency to jam than the flat bobbins. Likewise, the Kenmore is just happier with its curved bobbins.
Hope this helps!
Robbie